Thank you for the video about readline, I always wanted to learn more about it.
I ran into some issues, when I tried to follow your examples. I am using iTerm2 with zsh (and oh-my-zsh), and I cannot undo using Ctrl+. It prints ^ in my terminal. Ctrl+W, Meta+f, Meta+b, Ctrl+a, Ctrl+b is working fine, but all others kebindings don't. By any chance, do you know what reason can be? I tried to google it, but nothing useful was found.